Herts County Automobile & Aero Club held the first Westbrook Hay speed hillclimb in 1953, and organised all events there until the course closed in 1962. Between 1959 and 1962 the track hosted four rounds of the British Hill Climb Championship.
"The course is situated in the Westbrook Hay estate near Hemel Hempstead on the main Hemel to Berkhamsted road (A41). The timed length will be 500 yards and the road surface is tarmac. From the start on a gradient of 1 in 3 the road takes a fast left-hand sweep to come to a right-angled bend also to the left. From there the road sweeps to the right to the finishing line. The overall gradient is 1 in 11."
Westbrook Hay Hill Climb events and past winners
Key: R = Course Record.
References
Westbrook Hay Hill Climb Wikipedia(Text) CC BY-SA